Take-off and landing are considered the stages when accidents are most likely to occur, and everything should be fully controlled by the crew. Windows help them look outside, notice if anything out of the ordinary happens, and report it.

During day flights, the main lights onboard are off at take-off and landing, and the windows are the only source of light. Besides, when the shades are up, your eyes will get used to daylight, and it’ll be easier to find your way in case of emergency.